Delete row sig_1c9609f4a143 from signals

id sig_1c9609f4a143
event_id evt_96f9fd147571
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_678d54acf ...
dedupe_key signal_enriched:news_delta:3d7837e26da1a37c
throttle_s 0
created_at 2026-04-12T17:02:05.703295+00:00
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